Dolly-bar.



H, H. HUGHES.

DoL'LY BAR.

APPLICATION FILED AUG1211 1913.

Patented Oct' INVENTOR WITNESSES l UNITEDSTATES rAI'ENr OFFICE.,

HERBERT II. IIUeIIiis, or sfr. LOUIS, MISSOURI.

DonLY-BAR.

To {lili/,17mm it may concern:

'Be it known that I, HERBERT H."HUGiIns,- a citizen of the United States, residing at Sti' Louis, in the State'of Missouri, have invented a new and'\u seful Dolly-Bar, of which the fbllowing is a specification. .A

My invention relates to the construction of appliances used in heading rivets 1in fab- 'ricatingand erecting structural iron work, f and particularly relates to the class of tools known in lthe art as dolly-bars which are i 4employed to engage with one head of rivets to hold the rivets in position with'inthe holes in which they are placed while a head is being formed on the opposite `end of the rivets.

One object of my invention is to provide a dolly-bai",l having improved means whereby the bag' is more readily held in engagement with the, head on one endof the rivets'byv the operative while the opposite' end is beingupset to form la head thereon.

' Another objectof the invention is to pro,- vide' a "dolly-bari -having novel means whereby the jar on the operators arm dui'- iiig the riveting operations,l is greatly I lessened and to a large extent is overcome.

I A further' object of the invention is to provide a dolly-bai having a detachable rivet snap for engaging with the heads of "fthe rivets being driven and `having novel means or holding the rivet snap in position on the dollybar. J vStillfurther objects of my inventiolnfwilll become apparent as the invention is more p fully described hereinafter. Q "Referring to the drawings forming part df this specification, Figure 1 is a longitudinal section showing a dolly-bai"7 as constructed and arranged in accordance withy my invention. Fig@ is a sectional end View on the line II--Il ofFigs. 1 or 4; Fig. 31s

ha similar transverse section on the line III-.HI 2of, Figs. 1 and 4 showing,thev

means" employed for yieldingly holding the rivet snap in position on the end of the '"dolly-bar. Fig. 4 is a section similar to t hatof Figui showing a modified formof Y bar also constructed in accordance with my 50 n\vention. y

f In the ,accompanyingwdrawings the hollow shell or casing of m-y improved dolly-bar, v ich`ihay be conveniently formed of pieces ofpwrought iron pipe, as shown in Fig. 1, is

j formedgin two sections, theeiid of the larger .sectionv being swaged and shrunken on one Specification of Letters Patent.

tion 3 end of the smaller section 3 of the sli/ell so as to fasten the sections together and/y form in etlect a substantially hollow one piece casing. 'lhe rear end of the casing screwthreaded and has a cap 5 removably secured thereon, this cap being provided/with internal threads engaging the threads on the end ot' the casing or shell' y/ Hthin the hollow casing/is a coil spring 6, one end'of which engages with the cap 5 and also positioned within they smaller section 3 of the shell or casing is a plunger 7 f having a reduced portion Swhicli is within the coils ot' the-spring 6, the end of the spring engaging with the shoulder 9 formed at the junction of the reduced portion 8 with the niain portion of 'this plunger 7. Also positioned within the casing is a second plunger 10 having a reduced portion llex- 'tending into the siiiall section of the casing and having a recessedputer end which projects beyond tllie end of the section ^E2 of the as to be lengthwise movable. "A second coil Patented Oct. 12,1915/ Application filed Augustin, 191?. Serial N o. 785,890.

spring 12 is inserted within the' casing 2 one end of this springengaging with theshoul der 13 formed'by the end of the smaller secot' the casing', and the other end of r`the spring engaginglwith the shoulder 14 formed on the plunger 10 at the intersection of the reduced portion 11 with the larger or body portion 10 of the plunger. rlhe plunger 1() has a transverse vopening therethrough in which a pin 15 is insspd andthe ends of this pin project into the ots 16, 1G Iin the wall of the casing 2 so as to\ limit the endwise inoveinent ofthe plunger w hin the dolly-bar7 casing.

A sleevevl'? having inwardly curving en s 1S", 1S is provided to slip over the outside of, the easingf2, the curved ends 18 of the sleeve springing into annular grooves 19,1!) formed in the outeirv surface of the sleeve` 2, .in this v way providing a'guard which holds the pin 15 in position during the operation of the '."ilSilly-hair.r The guard sleeve 17 is adapted to slip lengthwise when pulled with sullicient force so as to uncover the slots 1G when it is desired to' remove the pin 15 from its position within the plunger 10 and casing 2. i i

I i. Positioned within the recess 20 in the ouier end ot' the'plunger 10 is a rivet snap 21 having a recess 22 in the outer end thereof inade to a standard size to lit a given size rivet head. The rivet snap 2l coniprises a end of the shank 23 of the rivet snap regis-` ters with a similar annular groove 26 Wit in the Wall of the recess 20 of the plunger 10 and a split spring ring 27 is inserted Within the recess in the snap so that when the shank 23 of the rivet snap is positioned within the recess in Will expand therein and hold the rivet snap in position when the dolly-bar islin use but still permit the removal of the snap by a jerk or pul'l whenl desired.

The slots 16 in the side of the dolly-bar casing are positioned and are of such length that when the operator exerts the usual amount of endwise pressure on the dollybar casing found to be necessary in holding the rivet snap 21 in engagement with a rivet head, the pin l5 in the slots 16 will be positioned at a point about the center of the length of the slots so as to be movable toward either end ofthe slots during the riveting operations.

The abutting ends of the plungers 7 and 10 and the socket end of the plunger are case-hardened so as to prevent battering or upsetting thereof in the operation of the dolly-bar.

In the modified construction shown in Fig. 4 the fdolly-bar77 is provided With an intermediate plunger t` having a reduced portion 28w0nwwhichathirdspring 29 is positioned, one end of the spring engaging With the shoulder 30 formedby the junction of the reduced portion with the body portion of this plunger. dolly-bar of Fig. 4 includes a middle section 31 in addition to the end sections 2'and 3.' .The sections of the casing are secured together in the same manner as in Fig. 1 and in other respects the construction of the dolly-bar7 is the same as that shown in Figs. l, 2 and In this construction the ends of the plungers 7 and 10 engage With the ends of the third plunger 4 instead of With each other.A

It willbe seen that a plurality of plungers, each engaging with a spring, are employed inmjLimproved dolly-bar, and it Will also be readily seen that its springs are separately supported so that each plunger and its sprmg operates independently of the other and, while butvtwo plungers are shown employed, a larger number of such plungers may be used When found desirable or necessary. y

In the operation of my improved apparatus the parts are assembled in the manner shown, and a rivet snap of the desired sizeis inserted in its socket in the dolly-bar.

-When a rivet is to beupset, the rivet is placed in position Within the hole it is to e plunger 10 the spring ring 27 The casing of the u fill in the usual manner. The buckerlilp or operator then holds the dolly-bar?? with 'the rivet snap21 in engagement with the rivet head and exerts a pressure on the dolly-bar so as to hold the rivet snap 21- tightly in engagement With the rivet head. The pressure exerted by the bucker-up Will compress the springs 6 and 12 on theA plungers 7 and 10, this operation moving the pin 15 rearwardly in the slots 176 in the dolly-bar casing. The operator readily determines the amount of pressure necessaryl to maintain on the dolly-bar during the riveting operations. The opposite end of the rivet is then'engaged by a pneumatic g riveter to form a head thereon, or a hammer is employed to form thehead, in the usual manner.

The shock of the blows transmitted to the snap through the rivet from the rivet hammer will be absorbed by the springs 'and in .this way the jar usually ,transmitted to the arms of the buckerup is very much leissened, so as to materially reduce the exertion necessary in driving'rivets andA reatly increase the capacity of the wor men and enable a much larger number of rivets being driven by the Workmen.

As the shock of riveting is taken up by the springs, the great Weight heretofore necrially reduced, and in this'way lessen the manual labor necessary in handling the dolly-bar i'n the rivet driving or heading operations. .A v i The operation of the dolly-bar shown in Fig. 4 Will be the same as for that Shown in the 'other figures Modifications in the construction and arrangement of the part may be made without departing from my invention. The size and number of the plungers and co-'acting springs may be increased; the manner of independently supporting the springs may be' changed; and the means employed in holdbar may be varied.. The dolly-bar, cass ing may be provided at an intermediate the length thereof, Aa. sectional plunger in said casing, a plurality of springs to hold the plunger'at one end of its lengthwise travel, said springs engaging the shoulders in the casing, means connecting the casing to the plunger for limitingendwise movement of the plunger, and a rivet snap de- 95 essary in such dolly-bars can be mate- 110 ing the rivet snaps in position on the dollytnehal'ilv' Secured in the end of one section of said plung l A dolly-harcomprising a hollow easing, a. plungerI lengthwise movable therein, said plunger he ving a plural i ty of shoulders thereon anfl h e ving a rivet snap detachably secured on one end thereof, and yielding means for holdingI said plunger at one end ot' its lengthwise movement within the easing. said yielding means comprising separate and inclepentlently operating springs` one end ot said springe being in` engagement with the easing, and the other end thereof engaging the shoulders on said plunger.

3. l lljfl :ir comprising a hollow easing, a sectional plunger lengthwise movable in 'the easing, e rivet snep removably seeurefl to the plunger, Seperate ineens for yielilingly holding eaeh ot' said plunger seetions et one end oi the lengthwise travel thereof, and means Comieeti'ng the plunger and easing for limiting the lengthwise travel of the plunger in the casino.

4. A dolly-her comprising a hollow eusing, a plunger lengthwise movable therein and having a rivet snap detachahly secured on one end,v and vieltlingmeans for holding the plunger at one end of its lengthwise movement in the easing, seid means ineluding a plurality of separate and indepel'ulently operating springs, one end of said springs connecting with the plunger', and the other end thereotl engaging with the easing.

In testimony whereof, I have hereunto set my hand.

HERBERT ll. HUGH ES.

llvitliesses:

()sw\Ln L. Jimmie, MARTHA 0. (,oLnMAN. 

